a person who opposes official policy, especially that of an authoritarian state 持不同政见者
adjective
in opposition to official policy 持不同政见的 the measure was supported by dissident Tories. 这项措施得到持不同政见的保守党党员的支持。
语源
mid 16th cent. (in the sense 'differing in opinion or character'): from Latin dissident- 'sitting apart, disagreeing', from dis- 'apart' + sedere 'sit'